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This adds a new mode, `UPDATE_SNAPSHOTS=force`, which will lower the threshold to zero, overwriting every image that is not _exactly_ the same. Most comparisons has a threshold because different GPUs render slightly differently. However, setting that threshold accurately can be hard. Sometimes a test will pass locally, but fail on CI. In those cases you want to force an update of the failing test. You can use `UPDATE_SNAPSHOTS=force` for that. And sometimes a small change _should_ update all images, but the change is so tiny that it falls under the threshold. Still, you want to make a point of showing that these images have changes. You can use `UPDATE_SNAPSHOTS=force` for that.
Test apps
Some application to tests various parts of egui and eframe.
At some point it would be nice to have automatic screenshot regression tests for these.